<template>
    <el-container class="home-container">
      <!-- 头部区域 -->
      <el-header>
        <div>
          <img src="../assets/logo.png">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">
退出
</el-button>
      </el-header>
      <!-- 页面主体区 -->
      <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px' : '200px'">
          <div class="toggle-button" @click="toggleCollapse">
|||
</div>
          <!-- 侧边栏导航 -->
          <el-menu
                background-color="#333744"
                text-color="#fff"
                :unique-opened="true"
                :collapse="isCollapse"
                :collapse-transition="false"
                :router="true"
                :default-active="activePath"
                active-text-color="#409eff">
                <!-- 一级菜单 -->
                <el-submenu v-for="item in menuList" :key="item.id" :index="item.id + ''">
                  <!-- 一级菜单的模板区 -->
                  <template slot="title">
                    <!-- 图标 -->
                    <i :class="iconsObj[item.id]"/>
                    <!-- 文本 -->
                    <span>{{ item.authName }}</span>
                  </template>
                  <!-- 二级菜单 -->
                  <el-menu-item v-for="subItem in item.children" :key="subItem.id" :index="'/' + subItem.path" @click="saveNavState('/' + subItem.path)">
                    <template slot="title">
                      <!-- 图标 -->
                      <i class="el-icon-menu"/>
                      <!-- 文本 -->
                      <span>{{ subItem.authName }}</span>
                    </template>
                  </el-menu-item>
                </el-submenu>
</el-menu>
        </el-aside>
        <!-- 右侧主体区域 -->
        <el-main>
          <!-- 路由占位符 -->
          <router-view/>
        </el-main>
      </el-container>
    </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      // console.log(this.menuList)
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(path) {
      window.sessionStorage.setItem('activePath', path)
      this.activePath = path
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }
  .el-header {
    background: #373d41;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      img {
        width: 60px;
        height: 60px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: none;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
  .iconfont {
    margin-right: 10px;
  }
  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
